Excellent! Here's a low cal version that will bring your cals per serving to 75-80 (depending on frosting):
Substitute apple sauce for oil
Substitute 3/4C agave syrup for granulated sugar
I substituted 1/2C of the flour with white bean flour. (Increased the cals but provided a complete protein)
If frosting is desired, just spindle some chocolate chips and spear when melted :)
Enjoy!!

First let me say that I was extremely skeptical over this recipe because of the tomato paste. I mean really, tomato paste in a sweet and sour sauce??? Well, what I've learned over the years will allrecipes is that you can't go wrong with 4-5 star recipes with 20+ reviews so I tried it.
This was great! I'm so happy I made it, w/o changing anything! After tasting it I pushed the limit and added some more pineapple, I shouldn't have. It was perfect from the beginning! I tried another recipe the other day which asked for food coloring. It too was good (though it got way too thick afterwards) but I'd rather have natural color (tomato paste) then have to add food dyes. YUMMO!